<form action="/upload" method="post" enctype="multipart/form-data">
  用户名：<input type="text" name="user" value="<%= user%>" />

  文件：<input type="file" name="uploaded_file" />
  <hr />
  <input type="submit" value="提交" class="btn btn-default" />
</form>

<form action="/delFile" method="post" enctype="multipart/form-data">
  <input type="submit" value="删除图片" class="btn btn-default" />
</form>
